oa South African Medical Journal - Some aspects on the effect of solar radiation and other factors of the climatic environment on human beings : (Continued) : C : the ultra-violet solar radiation



In South Africa many factors coincide in favour of a greater amount of ultra-violet radiation than that obtained in the lowlands of Central Europe. The greater altitude of the sun in South Africa results in a greater quantity of ultra-violet radiation and also in a further extension of the spectrum towards the short-wave end. The height above sea-level or large areas of the Union influences the ultra-violet radiation obtained in the same sense, i.e. increasing quantity and more effective quality. The intensity of the ultra-violet sky radiation is also considerable. This fact is particularly important in a country like South Africa where, due to the heating effect of infra-red and visible radiation, exposure to direct sunlight exercises a marked heating effect on the human body.


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